{
 "id": "mpeg-4-media-file",
 "name": "MPEG-4 Media File",
 "category": "audio",
 "identifiers": {
  "extensions": [
   "mp4",
   "m4v",
   "m4a",
   "f4v",
   "f4a",
   "m4b"
  ],
  "mime": [
   "application/mp4",
   "video/mp4"
  ],
  "puid": [
   "fmt/199"
  ],
  "magic": [
   {
    "offset": 4,
    "hex": "66747970",
    "notes": "MP4 Media File"
   }
  ],
  "signatures": [
   {
    "name": "MP4 Media File",
    "sequences": [
     {
      "position": "bof",
      "offset": 4,
      "pattern": "66747970{0-64}(6d703432|6d703431|69736f6d|69736f32)*6d6f6f76"
     }
    ]
   }
  ],
  "priority_over": [
   "x-fmt/384",
   "fmt/1616"
  ]
 },
 "status": "unknown",
 "summary": "Container format that can contain any of a number of audio and video codecs. It may also contain subtitle data or file metadata. This family of container can be used with several different file extensions.",
 "projects": [
  {
   "name": "PRONOM fmt/199",
   "url": "https://www.nationalarchives.gov.uk/PRONOM/fmt/199",
   "kind": "format-doc"
  }
 ],
 "provenance": {
  "sources": [
   "pronom"
  ]
 },
 "updated": "2026-06-09"
}